Flying standby ORD->BNA this weekend as employee family/buddy pass with low priority, chances we can get a seat?

Hi, pretty much title; I was looking at the seat maps, and it looks like only Economy Plus seats are open on virtually all the flights 3/15 and 3/16. Two of us are flying, what are the chances we would be able to get a seat Saturday/Sunday? It also is supposed to be a pretty stormy weekend for Chicago/Nashville, so I don't know if that affects it at all. Sorry if it's a dumb question, it's my first time flying standby and I'm just a bit nervous as I don't know how it really works! Thank you so much for any help or clarification.